#include <vector>

 #include <deque>

 #include <algorithm>

 #include <iostream>

 #include <ostream>

 #include <iterator>

 using namespace std;

 template <typename T>

 class conststaticconstant

 {

 public://class内含const static integral data(整数型别) member,那么就可以直接赋初值

     static const int _datai = ;

     static const long _datal = 3L;

     static const char _datac = 'c';

     constexpr static const double _datad = 8.88;//error: 'constexpr' needed for in-class initialization of static data member 'const float conststaticconstant<T>::_dataf' of non-integral type [-fpermissive]

     //static const float _dataf = 9.9;

 //    void operator ()(const T& elem){

 //        cout << elem << ' ';

 //    }

 };

 int main( )

 {

     cout << conststaticconstant<int>::_datai << endl;

     cout << conststaticconstant<long>::_datal << endl;

     cout << conststaticconstant<char>::_datac << endl;

     cout << conststaticconstant<double>::_datad << endl;

     return ;

 }